</pre><p>1. reverse</p><p><pre name="code" class="java"> /*** @Description: reverse a string.* @param str the String to reverse, may be null* @return reversedStr the reversed String, null if null String input*/public static String reverse(String str) {if (isEmpty(str)) {return str;}return new StringBuilder(str).reverse().toString();}2 .remove
/*** @Description: Removes all occurrences of a substring from within the source string.* @param str the source String to search* @param remove the String to search for and remove* @return the substring with the string removed if found, null if null String input*/public static String remove(String str, String remove) {if (isEmpty(str) || isEmpty(remove)) {return str;}return str.replace(remove, "");}
3.startsWithIgnoreCase
/**** @Title: startsWithIgnoreCase* @Description: check if a string starts with a specified prefix.* @param str input value* @param prefix prefix value* @return true if the string starts with the prefix, case insensitive, or both null, blank*/public static boolean startsWithIgnoreCase(String str, String prefix) {if (str == null || prefix == null) {return (str == null && prefix == null);}if (prefix.length() > str.length()) {return false;}return str.toUpperCase().startsWith(prefix.toUpperCase());}4.isAllAlphas
/*** whether value does not contain number(s).** @Title: isAllAlphas* @param value the source to be handled* @return boolean*/public static boolean isAllAlphas(String value) {// if input parameter is null, just returnif (value == null) {return false;}for (int i = 0; i < value.length(); i++) {if (!(Character.isLetter(value.charAt(i)))) {return false;}}return true;}5. isNumeric
/*** check if the CharSequence contains only unicode digits.** @Title: isNumber* @param str input str* @return true or false*/public static boolean isNumeric(String str) {// if input parameter is null, just return falseif (isEmpty(str)) {return false;}for (int i = 0; i < str.length(); i++) {// if there is a alpha, return falseif (!Character.isDigit(str.charAt(i))) {return false;}}return true;}
，相反，某天也许你会忽然发现，心早已沦陷。
